which power of a telescope might be expressed as "0.5 seconds of arc"?
Arc units are measured in Degrees with seconds. A conversion to Time would be: 0 min 4 seconds = 0 degrees 1 second 0 min 4 sec = 0o 01' Simplified then would be for every 4 seconds of time you would gain one second of a degree of arc.
A double quote (") can mean:seconds when measuring angles, eg 52° 5' 10" is 52 degrees, 5 minutes, 10 seconds (of arc); there are 60 minutes (of arc) in 1 degree and 60 seconds (of arc) in 1 minute (of arc)inches when measuring lengths, eg 1 yard = 36" is 1 yards is 36 inches.
The small angle formula is used for measuring the distance to a far away object when the actual size and angular size are known, or for finding out the actual size of a faraway object when the distance to the object and angular size are known. In arc-seconds: a = 206265 x D/d where a = the angular size of the object in arc-seconds D = the actual linear size of an object in km d = the distance to the object in km 206265 = the number of arc-seconds in a complete circle divided by 2pi In Radians: a = D/d where a = angular size of object in radians
Hg= Mercury Au= Gold
60
There is no such thing as one degree of minute.There are 60 minutes of arc in one degree of arc and 60 seconds of arc in one minute of arc
which power of a telescope might be expressed as "0.5 seconds of arc"?
divide the seconds by 60.
Seconds/3600 = Hours
I can resolve 100 arc seconds. If craters are 60 arc seconds I'd bet that there are people whose eyes are good enough. 60 arc seconds is certainly within the 20 arc second maximum capability of the eye.
1000 x seconds = milliseconds.
An arc second is 1/60th of an arc minute and 1/3600th of a degree. This means there are 60 arc seconds in an arc minute, and 3600 arc seconds in a degree.
The duration of Misère au Borinage is 2160.0 seconds.
The duration of Kafka au Congo is 3540.0 seconds.
The duration of Au Revoir Shanghai is 2700.0 seconds.
seconds